My Lenovo shuts down on its own.

My Lenovo shuts down on its own whether I am playing Chuzzle (a game), surfing or just plain typing a document and lately even when I am boot scanning. After scanning only 10% of my data, it shuts down on its own. Everytime it shuts down on its own. I tried turning on the power but it shuts down on its own again. I have to let around 10 minutes pass and turn the power on again. If I do this, it goes back to normal.

Thank you for your reply. It does not restart. It shuts down. People say that its a heat problem so I bought a cooling pad placed under my laptop. I cleaned the air vent which was not clogged with dirt. Still the problem persisted. Just a few hours ago, we were in an airconditioned room. I was backing up my files in a portable Hard drive. It shuts down in the middle of this back up. I waited for around 5 minutes. Turned it on, and tried backing up my files again. After a few minutes, It shuts down again on its own.

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